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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16c8a0f27778ca86da5ced621208882526bc4c92b3766268daa71962aafac5a' 
  AND token = 'MUaO4QKKRyjQT7Gi+0vZ9UP1xJD+oEVjknrhB/xXcyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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