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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f9cd00dfb500a2cffc8de2cf295ec959fe24294e605e2e8d3f91f30f2adc97' 
  AND token = 'rZuHastziopNSupafpHQfFg4ivp8DYZqYUkR1ihrc78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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