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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f8de569900e3bbb1a163f050f06b1e4eb36d0b47f08db1be53efe7d9182fa2' 
  AND token = 'uhDTVMtJq3n1JkLVBDV2e68eL43Gc37GK1Imoe94l0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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