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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b14f7273b9a64999ace65484edd214955844cbd97174612c91ecb94a319432f' 
  AND token = 'tChFbP+3ciIRu44JW8krXduEm+ffd2eL47EsQmqSShE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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