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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69367efe6ed23e20877a00601c788f8015dc8d036bdd374a85bbd994ac894155' 
  AND token = '7+1+7UcCEGxtG62nZzrM/Z6am6s/G/F+4Iqvzcch2es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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