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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ad3d50124d0eac2ac583ffe46ad47793a4330b53eb46b8811d72ab7a5b9f36' 
  AND token = 'MDGayLPyCAjMgPAH0HNleHJiB8mcv7ezj6rinI7lHyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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