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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38c7e19c1329cb1d501115b37d965f04bac7d6880f5d839b220ecf41336e891' 
  AND token = 'ktmCr9oxSuiro4jWc+mwuXqBZO3dJjFDFKpts3uPD34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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