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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fae9ea6b7bd3088170e658531ca3fbdb7024a011f3a0dc7825be6e2f111029d' 
  AND token = 'ze1n7w7/zZlR1liI+iHyeCWK1Zz9bAkhFt6taiYKnUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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