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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bbe6aab9033f7e8563e9c6996b0b112a6e3c1cb04ba5570ddf76edd6e98a28' 
  AND token = '3DrkTMzUDe50kxqoDVf22z6eJAGmNjkkyVnfzDYQBPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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