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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4292fb8619aafee05788517450db4c18bca5fd89278f8fda2906bb38406afdb5' 
  AND token = '4SomzH+gyLsFogNp2acn6eJnRSZMuGPCaW3104Oq23g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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