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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b849cf6382ff120a93c365602f00b68134ef07be89d6d53351a31162d369d578' 
  AND token = 'oGu+qutET316f+L/JjA+ibzuezO53toU193TcH2ig5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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