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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792fb8a40a7f690d57a1fc3d54d5b6a089cba730cbf1596957a60e9d6a94e2ac' 
  AND token = 'g7xEkf7blhb0PtLWu1mpz7AaC9grTLDTYsjZOL66uQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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