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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199882c4fbc6fb179487c47f6ccb2b3a9359298022381ce0ea8c5ef04b9540b8' 
  AND token = 'DAzjwhlQOJTQtkJ92nmp33z1CMiud8P4gHr2w2YcWJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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