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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796a829f0a86f195d102730f599512aa41624e0f31c6c40a18ad279e58f315f2' 
  AND token = '3aR0hdA08GDn2baJEKaEMZ9N04GzNWqDRYBGLJOmk2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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