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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79783d71a246c42a7b5eb7df4de7ded042b8a92589fe1bc775e90bea0dc6b4eb' 
  AND token = 'a4jAwjWlfWVf0xN/ERRECezPQ8M2jmgtP3OACtF6+Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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