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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b007b8f39d088a673ece118bb94738f5bde386f5fd9418a58b948310b8362b7d' 
  AND token = 'V3BIyQKB4LdNRs1IILoBmDnQJwE9k5sd9tiAfuYIQxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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