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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22dcc58369f17270c8a256165bdb29b558e8cec4fcc6c6e1db0ecc2ae9ffd5d2' 
  AND token = 'j4kvjN8PRORngqz+W8Yi7ngPbwR5vV6iqQvCgO6YyZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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