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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca5f69bb4eb1c4ccd00991ca632aa50964fc5b183518dbf21a978d4d42d6e9' 
  AND token = '+MZzWLNG/q5ISvxdyO5RjV13/d1mnY8ksBZF8O9kkZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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