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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1086b595decf939af6cbfde1a92463b7b46c9188dcba986d68f474cadb89fb' 
  AND token = '8Ffi0or+Cs09wLJEua4qaLF7w57y+eSBQweM0tQ1UEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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