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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eb3edbc7f955516ec0a7a97d5a6087a9aa69b2d4327a48fdb59340c60bc5fd' 
  AND token = '27aaCGNKMC2flnDT6xQNs2JJZ+YThWOuVVohAFBsFB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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