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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3edac713f904b622e22a8eb36e62111a8f66e71702f74906e382d73ea4469f' 
  AND token = '+0F+kRlDP2zCqqy9o8YpeV5IJT3Z2DrkmMUH/XLcr5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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