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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a9b44ffaf7560674a6e7d59638327ed179c189bc119e25289fd55cadacc65c' 
  AND token = 'ek57CGF8D4bRiq4TDne/B5e7bmA+FlQcRBdYDS16Oog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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