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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07be151f489fb1f7c7f14ad7c92177f1120a66477e4a5b659fd325ec715708a9' 
  AND token = 'uZv3CGiyjNPKyzXc7Y27SrGBk0+ifcNWk6HscKnLDUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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