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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edd8fb93a32bd512275df925c07c2e6b3a1f745aae312ec17258669f1c41b9f' 
  AND token = 'LS/MuS7U6dkNHQUnwXeOfBxhKCR91//i4GQtPCuFykg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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