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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb166d20d9c88398d9ff11353e77ca6e398cac4795aab4ec58397db0f3b4def' 
  AND token = '5Woi0jRsyYAJ8hwYPjXV3OjLHtMkBqQrhITArmoi9U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}