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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfacc9a5363b42715e393b2ebe0acafc8158c8ae9068ec1d9e1cc0c346ec80d1' 
  AND token = 'A7AJBQ8+GSf1eF3S4YckhoTXDC153vXKq/BPyVGajSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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