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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6723fb808248169ad64e3738a517ef9a397a73d48d0727473714789d6b721876' 
  AND token = 'a4rnPvcH3y80SoJS3/O7g7SU1nB2QZILLdBx1cOlQ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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