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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85275787c8f21f93c88435f2e1362d16443c3c8a174f6a74e4ccf84df087307' 
  AND token = 'ByKi/e9Rmd92N7Zj3jLdEsd6KrLQLmnmtHAsfzySyDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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