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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c57a1ed18cf6357ce978e267e156afc19cec842084a02e7bbbc2661795298ba' 
  AND token = 'NYiyQ69PNMQ9C4EcyLvSKnFgPku7KiCBMfOGnKMjc0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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