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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6409f087ac0b84400aa2237a5784a73077c1c7137a4d5a7b4bbdbeff3df48a1' 
  AND token = 'aBucuC+YSlm8eWk5Uye7Qj7JkvZl+JOcbzyW3yQ42wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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