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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9d66f8252ffd73a42fecfda294cb5a4d60c46fe65ce8894c10072370a723bc' 
  AND token = 'hdF2fQid1ZM0VXf6NGZKQyspDl6c8dzRTq5REGeGlkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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