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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474cbeb6dbf07ff0501151d09442f86a6a9b020b4509192700c2debd2a82db4c' 
  AND token = '+egcMfTfLcapIqOELp+R7FGvKMGLnbhW0d411pMmTjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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