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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2d7e01026afb5d71954ad5ac7e2888affd7c0e386de7a2836d780d244fb60e' 
  AND token = 'erIcQkrkGaEhMxrr7hhsPvNPAXi1erQrgcNkqm/v9dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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