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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98c06810451a0b75281b3c40855a17f154044ee615d3c4237500ad79d49177' 
  AND token = '6/YliH9CiTYPYzl/DA+b1+bHGQ2SiiDJl+bO2rYUhfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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