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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4396fd5f453a6fd41d638ef47a62a5e07c2da414776891ed6ebae31abbd117d' 
  AND token = 'ZWAaye9+mqG+4h2Spu/KT0RZGGC5m4XY7YgkaxT3pXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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