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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c03c4319ba6ad8dadce93dd0b718c97e92f4bf06f9e0b7e4833342173d7e6b' 
  AND token = 'e+Sa7A3//M6JW/S7blYU5mp1u+x/MMDQvFUix72K1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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