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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e926a7eab04f558b82503c1c90679621cbe86dfc94d6fd1acc8c3d0900305c1' 
  AND token = 'NGmGSK7TxBmsMEMuNH3ZOjmv2ET6ngfCv3EAs1QAOk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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