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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8036d27b8450637291b20374425d4e597a1f98df8f8913a5985b52b80d566f9a' 
  AND token = 'PhZrJRTwRKBZ+M4fhD06A/7D5r6Hy2mL0TJiycGiOik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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