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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b26703b0a5b4619602c5f4bf424055392ed118acce86ba986fbbc6a6b4fee8' 
  AND token = 'HGTku6LiqDzzqe8u+E5OKcE4//dM8SBI2MIUQeZFLZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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