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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a87a9a47a2c1a7dda3d785cc42cbd137aff35a9bbab29238da86a7677ee87e' 
  AND token = 'ph1OPEQvvdgh9KjNUDeDGZsA4tdKkbwRbLMvPa+ovHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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