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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5105c71e2d9ac90eb888c46cc433513729c6bef54402d2c2cff6b3a655e62abf' 
  AND token = '6ymbVH1qwAVHW+37jhCK28fObIo1qg1oCGbcI2TldGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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