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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1055bdc2a6d22657e7ea6067a6cba9d6d620ba1cf382716918b45a38f7afca2e' 
  AND token = 'Cx7qI6TVWOjfYh58zKctBEyzwyPC5JcTd0HcD1ZqZvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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