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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01c46e0441a003d05db543bedef2dac8129d73173aeb277c099dafc2a851219' 
  AND token = '5OLPZjY2uW6rr0mfJIhwz1Q2db6RrdUV49qd76li5JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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