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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a65ff8177eb98ab2ce374379a7c70778b7d4de0df2d0cc9c5fec52b2c0b09a0' 
  AND token = 'Q4Q/Mh9Q4cuiTQKFChVePhdR2RC24zWwnyMeCZ6BA1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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