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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391d667579cef19eee8ec7663f82415c3bcc8759d15f25c02256587fb6279d15' 
  AND token = 'd77ZTmjCn0W8gPokkVsey1TL5F+dw/q4wZnEjwy+ik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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