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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51334d9468e44c4f9295268f14ed72dca52157a118e6d09af471314b71af0dd4' 
  AND token = 'f31mttfnc2HFl6/7Zjl5VWu8WN1VBqbm9rlAUt0N6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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