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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab7c5501eb61a5875f42178142c04bf2d07b865ddf704590bcb7fc598af17ca' 
  AND token = 'aRocJxyi7EYPEMwSPgwQgEM5E3buYvrM7gYyFmPf2Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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