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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1c5f3145ee5ad15456a1389243a433bf13795a2d3a9bb527bd92d48ef6848c' 
  AND token = '26+REpX0l0RPU0gO2MQNlNcQC6JgFTO/0JomroGqdRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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