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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e968e2c3a6e77d182238ccce9ee586ca61e267f8206a0220ba49e0120216c1' 
  AND token = 'tfc8u3mEY2O6jFPvq406SI2DHgWQPLxQ9VpL69t5/8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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