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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92206451c2263e942da98070f90aed7bd6b61130cc8412fcba97b3f1da1eaeec' 
  AND token = 'aIPADtrODPZEcAtFbl5gMt4ZWP9VDEpKmTIQm6NF6Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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