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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3de58cca3650d75ec642c44b22d29eced1c7f6ef06ac526a6443e20c9a57d9' 
  AND token = '2pscJzrfIXp5HW5+ZzwyethB70av+PhCJU/1Ujr21Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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