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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adeea80ab505da34dcf9a407b83e4abbb3f5faf0942173a549b9672086237fce' 
  AND token = 'HrP5fFNy6Z0vsv6THsVdxUJdggBV48stN3OAEau90Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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