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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941610ec6f0fb6cdd3a02253fcc51ce7daa6f0286a0ade39d372697da71ef361' 
  AND token = '/BxlK11cROXIiQXS3jg8BX14MxGXLdUowCRLkNDY64w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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