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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aaf747b1a0fbe3aac706bc0ce0dc954c6d126611655498d507ea026d7b6b85' 
  AND token = 'tF2opSx5hiAvZVlP69xucvLwuks4V7YS8Ff2UeNPqOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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