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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86215b8844f71db8e442d3e361704800fa0f97f4194fd15759a9fc9042c80ff2' 
  AND token = 'N/lDzrmBRooqrmU/eLtU+Ml4AsAa+QTM6q8/CaE9l4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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