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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d4ad629fd9dd20a403a81e90d8054ada3bff30e50974371666a40e8e2193f1' 
  AND token = 'tiYH+H6WyHam48XRW5A4hp6f5o80CAkBArp1NNmnjnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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