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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2ca75019220c1bf7611afa65cc27b9bf093157ffbe49673262e966bd41149c' 
  AND token = 'SsnPUhCclZ9kSrWGvYTnzxhJqF1yO8GYROf4UI7pR0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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