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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ce4e683a63c2204b750678985d69102701e1f6ec9cd74aaddc0dd3a8e45fef' 
  AND token = 'yFgkbycFSwTC+avOtrlEYVfO/cJGH1YVqA3Qb42VrA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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