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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc50db6570fafe8a5da6b3d8807bf40877b790b15f68af130c25b9432c380088' 
  AND token = 'V+nYlW7Qxl1ZZ4z11y4Fc2nKsYA+uqHaLfl8R4edbSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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