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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9277f6c7fe2f4874d7287e72f6a3589f7070a9a5a441ea85ff05fb2b8ba44472' 
  AND token = '4+bWpPDmWAwv6+40cMZ8XJaXP8RH3Cyl0Vjbbk4LhoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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